Among high school students, most not old enough to vote, Johnson gave a breakdown of what his role is in Washington, D.C.

While at Homestead in Mequon, the senator even talked about the lawsuit he just filed against the Affordable Care Act, disagreeing that lawmakers and staff get subsidies for their insurance.

Sensenbrenner called the lawsuit "an unfortunate political stunt." Lyles asked Johnson about the criticism.

"Well, it's certainly not a political stunt. I think in my interviews I've pretty well shown that. This is a serious and constitutional issue and basic fairness," Johnson said.

While both agree on repealing the health care law, they don't agree on this part of the federal plan, but does this small dispute signal a bigger problem within the Republican Party?

"We had one before, and I knew he wasn't particularly supportive of it, and I know our staffs have talked, and I'll have a discussion with him again. This will not be any kind of long-term rift by any means," Johnson said.

This isn't the only bruise for the GOP right now. New Jersey Gov. Chris Christie's highway shut-down scandal is leaving a mark too.

"If the facts are what he says they are, I think this will be a little bump in the road for him as well," Johnson said.

Earlier this week, Sensenbrenner said Johnson's lawsuit focuses on a "trivial issue" of the law, and takes away from their larger goal of repealing it.